Sample rack



FIG. 1 is a top perspective view of a sample rack showing a sample tube out of its place in the sample rack;

FIG. 2 is a top perspective view of the sample rack showing the sample tube in its place in the sample rack;

FIG. 3 is a bottom perspective view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a front view thereof; and,

FIG. 9 is a back view thereof.

Broken lines shown in the drawings are included for illustrating portions of the sample rack that form no part of the claimed design. 

CLAIM The ornamental design for a sample rack, as shown and described. 